Insulated switch-cover.



A. A. TIRRILL. INSULATED SWITCH COVER. APPLIGATION PILBDAPLM, 1910.

Patented June 4, i912.-

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Mom m3 lie ' tained in place by a simple and-eflicientthe same, the switch mechanism beingsh-ow-n' simply in a fragmentary'Way,-. in view of the fact that the latter constitutes no part of the present invention, Fig; 3 is an en 7 To all whom it ma concern U TED STA first co er PATENT-OFFICE;

ALLE'N AQ TIRRILL, or soHnnn'oTAnY, NEWYORK.

' "INSULATED swrromcovnn;

Be it known that I, ALLEN citizen'of the .United- States, residing at Schenectady, in the county of Schenectady and State of New York, have. invented oer-,- 'tain new. anduseful Improvements in- In-- 'sulatedSwitch-Covers, of'w'hich the following is a specification, reference being had therein to the accompanying drawing;

vision of a metallic cap adapted to coo erate with an insulated switch base for inc osing the switch mechanism, said cap being lined with insulatingmaterialadapted to insulatethe operating parts of the the same from sWitchQ The invention contemplates the provision of aninsulating lining for the metallic cap H ing engagement between a part of the metal plates the formation of a metal'cap having adaptedto be inserted in the cap and refastening device, conveniently an interlockcap and a part of the lining.

More spe'cifically,-the invent-ion contema notched or recessed portion, the metal ad-v joining the notch orrecess being offset or struck inwardlytooverlie an adjoining edge of an insulating lining within the cap to secure the lining in .place.

The invention further embraces improved .instrumentalit-ies for centering or lining the cap with the mechanism ofthe switch when the-cap is being secured in place,

The novel features in the constructionan'd' arrangement of the parts of one embodiment of the invention will be apparent from the detailed description I hereinafter contained,

when read in connectionwith the accOm-L pany ing drawings formingpart hereof and wherein said embodiment-is illustrated;

In the drawings,.Figure l is a perspective View of a switch showing my improved cover in place, Fig. 2 is a sectional view of largcd detailview, and Fig. 4 is a sectional View similar to Fig. 2 showing a slightly inodificdform of cap and. insulating lining therefor.

Referring more specifically to the drawings, wherein like reference characters desiguate corresponding :portions in the several A. TinniLn, a-

This invention relates to improvements in -v switch covers and has for its object thepro Specification. of. Letters'Iatent. PatentedJ 111164, 1912'. Application filed April 14, 1910.- serial No. 555,467.- I

'view's,'A represents a switch base of porce-' -l'a1n or similar insulating material provided with an annular-c ap seat B adjoining said seat.

switch mounted on the base A, the'same secured to the basehaving an aperture-d threaded offset securing flange E and aguide-eye orbushing 11) formed therewith,

. 4 V I J, (l represents iragmentary portions ..of --a' comprising-in part a supporting bracket A 4 and an'operatingcord or chain D adapted.

to work throughsaid' eye.

F represents an inverted cup 'shaped metal cap adapted to cooperatewith the base in inclosing the switch mechanism. This cap movement, so that the operative association of the parts is constantly maintained.-

The" insulation of the cover is formed in two pieces, one being a shallow cup-shaped portion 1, and the other a split-cylinder J.

The portion I-isperforated to accommodate the operatingcordorchainand the fastening screw, and hasafiange z' flaring inwardly v engagement'with the metal cap whenforced and outwardly to secure a firm peripheral in place. 4 The split cylindrical. portion ;J

snugly fits-the interiorof the ,cap," abutting I V at its inner edge against the-edge of the .fiange 2' of the portion Land the two members are firmly secured in position by means ,of a tongue K struck inwardly 'from'the 7 metal cap at the top of anotch or recess H therein and engaging beneath a correspond i ing notch .or'reces's j in the cylindrical portion. of the insulation. -lhe insulation-extends-outwardly, as indicated at L, to an appreciable ,extent beyond'the edge of the cap to bear upon the seat B onthe-porcelain baseA.

It is desired that the insulated cap shall fit closely relative to the switch mechanism,

in order that the device may be as'compact and small as possible, and inasmuch as the center of the cup-shaped portion 1- ot' the,

insulation may have a tendency in time we buckle inwardly andpossibly contact the operating parts, the same is cut away as at M, and the corresponding center'part of the metal cap raised as at N to ifectuallyremove the same away from possible metallic contact with the switch parts. This raised As shown in the enlarged detail view constituting Fig. 3, the porcelain base A may be provided with a lug C adapted to enter the notch orrecess Hein the cap or cover to serve, asdcsired, either alone, or as an additional means, for properly centering or alining the cap'or cover, and to prevent'turning of the cover relative to the base, as is obvious. i

In Fig. 4-, I have shown the top of the cap flat, as distinguisl'ied from the cap of the preceding. figures, the cup-shaped portion I of the insulating l ning bemg continuous tln-oughout save the a ')ertures for the fastening screw and operating cord or chain, and in this instance an interlorly rounded hollow rivet O secures the cup-shaped portion of the lining to the top of the cap and constitutes a eonvement guide for the operating cord or chain.

It will be understood by those skilled in the art that the-present invention is capable of embodiment in forms and devices other than that specifically disclosed herein.

I claim: I

1. In a switch, a supporting base havinga lug'thereon, switch mechanism mounted on said base, a cover for said mechanism, means for securing the cover in place, an" insulating lining for the cover, the cover and lining having a notched portion adapted to receive the lug on the base, and a portion of the cover adjoining the notched portion thereof being offset .to engage beneath a corresponding portion-of the lining to retain the lining in place. i

2. A switch cover of the character described comprising a metallic cup-shaped member notched at one edge, an insulating v lining therefor, said lining being correspondingly notchedat its edge, and a part of tln'.- metal of thecup-shaped member being oilset at said notched portion thereof to underlie a corresponding portion of the edge of the lining, substantially as described.

3;A switch cover of the character described comprising a cup-shaped body having a notched lower edge, andan insulating lining therein comprising a cup-shaped portion fitting the top of. the cup-shaped body, and a. cyl ndrical portion fitting the lower part of the cup-shaped body abutting at its upper edge against the edge of the cupshaped portion of the lining and projecting at its lower edge an appreciable distance beyond the edge of the cup-shaped body, the lower endof the lining being notched to correspond to the notch of the cup-shaped body and the cup-shaped body having a part offset to underlie a corresponding part of the lining oining the notched portions thereof to retain the lining in place.

. 4. An article of the character described comprising a metallic switch cover having an inwardly turned lug at its open edge, and an insulating lining for the cover comprising' an end member and a side member, the inner end of the side member engaging the marginal portion of the end member to hold the same in place, and the lug on the cover engaging the outer edge of the side member substantially as described.

5. An. article of the character described comprising a-metallicswitch cover, and an insulating lining therefor comprising an end member for the closed end of said cover, and a side member, the inner end of the said member engaging the marginal portion of the. end member to retain the same in place, a part of the metallic cover engaging the side member to retain the same against removal, substantially as described.

6. An article oftlie character described comprising a metallic switch cover, and an insulating lining therefor, the switch cover being notched to provide a lug overlying, the lining to secure the same in place, the notchbeing arranged at the open edge of the cover, substantially as described.

7." An. article of the character described comprising a metallic switch cover and an insulating lining therefor comprising a cupshaped end member for the closed end-of the cover,-said. end member having a flaring marginal portion and. a side member having its inner edge abutting the end of the flared portion or flange of thgend member so that the lining is continuousdandfibstantially flush, the cover having a part engaging the side member to retain the same in place,

substantially as described.

In testlmony whereof I afiix my signatu re in presence of two witnesses.

' ALLEN A. TIRRILL.

Witnesses:

DANIEL NAYLON, Jr., M. M. Hooxrono. 

